Lazy field initialization with lambdas

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Within your actual lambda, you can simply update the fooField with a new lambda, such as:

class A<T>{
    private Supplier<T> fooField = () -> {
       T val = expensiveInit();
       fooField = () -> val;
       return val;
    };

    public T getFoo(){
       return fooField.get();
    }
}

Again this solution is not thread-safe as is the .Net Lazy<T>, and does not ensure that concurrent calls to the getFoo property return the same result.

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